我有一个相当复杂的 java 函数,我想使用 jUnit 进行测试,为此我正在使用 Mockito.这个函数看起来像这样:
I have a rather complex java function that I want to test using jUnit and I am using Mockito for this purpose. This function looks something like this:
public void myFunction (Object parameter){
...
doStuff();
...
convert(input,output);
...
parameter.setInformationFrom(output);
}
convert 函数根据输入设置输出的属性,它是一个 void 类型的函数,尽管输出"是参数是正在使用的,就好像它是由函数返回的一样.这个转换函数是我想要模拟的,因为我不需要依赖于测试的输入,但我不知道该怎么做,因为我对 Mockito 不是很熟悉.
The function convert sets the attributes of output depending on input and it's a void type function, although the "output" parameter is what is being used as if it were returned by the function. This convert function is what I want to mock up as I don't need to depend on the input for the test, but I don't know how to do this, as I am not very familiar with Mockito.
我见过的基本情况是 when(something).thenReturn(somethingElse)
或我理解的 doAnswer
方法与前一个方法类似,但可以添加更多逻辑,但我认为这些情况不适合我的情况,因为我的函数没有返回语句.
I have seen basic cases as when(something).thenReturn(somethingElse)
or the doAnswer
method which I understand is similar to the previous one but more logic can be added to it, but I don't think these cases are appropriate for my case, as my function does not have a return statement.
如果您希望模拟方法在(或以其他方式更改)参数上调用方法,您需要像这个问题一样写一个答案(如何模拟影响对象的 void 返回方法").
If you want the mocked method to call a method on (or otherwise alter) a parameter, you'll need to write an Answer as in this question ("How to mock a void return method affecting an object").
来自 Kevin Welker 的 回答那里:
doAnswer(new Answer() {
Object answer(InvocationOnMock invocation) {
Object[] args = invocation.getArguments();
((MyClass)args[0]).myClassSetMyField(NEW_VALUE);
return null; // void method, so return null
}
}).when(mock).someMethod();
请注意,较新的最佳实践将具有 Answer 的类型参数,如 Answer
,并且 Java 8 的 lambda 可以进一步压缩语法.例如:
Note that newer best-practices would have a type parameter for Answer, as in Answer<Void>
, and that Java 8's lambdas can compress the syntax further. For example:
doAnswer(invocation -> {
Object[] args = invocation.getArguments();
((MyClass)args[0]).myClassSetMyField(NEW_VALUE);
return null; // void method in a block-style lambda, so return null
}).when(mock).someMethod();
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